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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 351 | case 'site_users_network_per_page': |
| 352 | case 'plugins_network_per_page': |
| 353 | case 'themes_network_per_page': |
| 354 | case 'site_themes_network_per_page': |
| 355 | $value = (int) $value; |
| 356 | if ( $value < 1 || $value > 999 ) |
| 357 | return; |
| 358 | break; |
| 359 | default: |
| 360 | $value = apply_filters('set-screen-option', false, $option, $value); |
| 361 | if ( false === $value ) |
| 362 | return; |
| 363 | break; |
| 364 | } |
| 365 | |
| 366 | update_user_meta($user->ID, $option, $value); |
| 367 | wp_safe_redirect( remove_query_arg( array('pagenum', 'apage', 'paged'), wp_get_referer() ) ); |
| 368 | exit; |
| 369 | } |